Seamless injection-molding for 100% liquidproof protection Expansion pleats for easy donning over heavy-duty work boots Thumb pocket at the top allows a non-slip grip for easy on Frigiflex PVC compound stays stretchy & flexible in cold temps Increased thickness in the heel, toe & cleats for longer life No lining for easy cleaning, laundering, and decontamination Molded-in buttons and holes for ideal fit and protection Heavy-duty heel kick for hands-free removal High-stretch upper with durable, abrasion-resistant outsole